On my website articles and pages are added and deleted frequently and in combination with more then 2000 visitors a day it sometimes give white pages when you click on a link.
You have to purge all SEF urls to fix the problem.
Next to that sh404SEF does not work that good with Virtuemart and give depending on which server specs you use error.
But for the normal website its worth the 25 euro
Thanks for your review. You're indeed in a situation where you need to be careful about what urls are stored in the database. I am however very concerned about your comment regarding Virtuemart. In depth Virtuemart support has been a very strong feature for sh404sef from the start,and still is today. We are not aware of any outstanding issue with Virtuemart, so please contact me at shumisha at gmail dot com for details.